AI845 ABB Ability™ System 800xA® hardware selector

Features and benefits

• 8 channels for 0 .20 mA, 4 .20 mA, 0 .5 V or 1 .5 V d.c., single ended unipolar inputs

• Single or redundant operation

• 1 group of 8 channels isolated from ground

• 12 Bit resolution

• Current limited transmitter supply per channel

• Advanced on-board diagnostics

• HART pass-through communication

The AI845 Analog Input Module for single or redundant applications.

The module has 8 channels. Each channel can be either a voltage or

current input when MTU TU844 or TU845 is used, when other MTUs

are used al channels become voltage or current inputs.

The voltage and current input is able to withstand an overvoltage or

undervoltage of at least 11 V d.c. The input resistance for voltage

input is greater than 10 M ohm and the input resistance for current

input is 250 ohm.

The module distributes the external HART compatible transmitter

supply to each channel. This adds a simple connection to distribute

the supply to 2-wire or 3-wire transmitters. The transmitter power is

supervised and current limited.